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2. Do adenomatous polyps of the colon become malignant?;Castleman;N Engl J Med,1975
3. Experimental carcinogenesis of colon and rectum — similarities to man;Cole,1978
4. The adenoma-carcinoma sequence;Day,1978
5. Selektive Erzeugung von Darmkrebs bei Ratten durch 1,2-Dimethyl-hydrazin;Druckrey;Naturwissenschaften,1967